Counterclaims notwithstanding, here is the list. Some may question why So-Cal's SOUTH COAST PLAZA is given such a low-ranking position. Strictly speaking, the 2 SOUTH COAST malls consist of 2 separate structures that are not, technically, "under one roof".

IN GREEN = Article on MALL HALL OF FAME site
IN BLUE = Article on SHOPPING MALL MUSEUM site


Sizes according to Gross Leasable Area

1. MALL OF AMERICA / 1992 / Bloomington, MN / enclosed / 2,942,000 leasable square feet (4,870,000 square feet of floor area)
2. AVENTURA MALL * / 1983 / City of Aventura, FL / enclosed / 2,960,000 leasable square feet
3. KING OF PRUSSIA MALL / 1963 / Montgomery County, PA / enclosed / 2,902,000 leasable square feet
4. DEL AMO FASHION CENTER / 1960 / Torrance, CA / enclosed and open-air / 2,608,000 leasable square feet
5. ALA MOANA CENTER / 1959 / Honolulu, HI / open-air / 2,581,100 leasable square feet
6. 
ROOSEVELT FIELD MALL / 1956 / Nassau County, NY / enclosed / 2,359,200 leasable square feet 
7. SAWGRASS MILLS * / 1990 / Sunrise, FL / enclosed and open-air / 2,259,000 leasable square feet
8. DESTINY USA / 1990 / Syracuse, NY / enclosed / 2,250,000 leasable square feet
9. WOODFIELD MALL / 1971 / Schaumburg, IL / enclosed / 2,224,000 leasable square feet
10. PALISADES CENTER / 1998 / Rockland County, NY / enclosed / 2,217,300 leasable square feet
11. SOUTH COAST PLAZA / 1967 / Costa Mesa, CA / enclosed / 2,212,000 leasable square feet [Does not include GLA of CRYSTAL COURT / SOUTH COAST PLAZA WEST]
12. TYSONS CORNER CENTER / 1968 / Fairfax County, VA / enclosed / 2,200,200 leasable square feet

13. WESTFIELD GARDEN STATE PLAZA / 1957 / Paramus, NJ / enclosed / 2,174,900 leasable square feet
14. THE GALLERIA * / 1970 / Houston, TX / enclosed / 2,123,000 leasable square feet
15. WESTFIELD VALLEY FAIR * / 1956 / San Jose and Santa Clara, CA / enclosed / 2,044,900 leasable square feet  
16. OAKBROOK CENTER / 1962 / Oak Brook, IL / open-air / 2,090,000 leasable square feet
17. SCOTTSDALE FASHION SQUARE * / 1961 / Scottsdale, AZ / 2,080,200 leasable square feet
18. FASHION SHOW (MALL) / 1981 / Clark County, NV / enclosed / 1,888,100 leasable square feet
19. NATICK MALL / 1966 / Natick, MA / enclosed / 1,860,000 leasable square feet
20. NORTHPARK CENTER / 1965 / Dallas, TX / enclosed / 1,809,800 square feet 

* Renovation and expansion underway in 2017